Simultaneous Joint Diagonalization of High-order Cumulant Algorithm for Harmonic Frequency Detection of Power System
Xing Yin · Shaanxi Electric Power · 2011
A simultaneous joint diagonalization of high-order cumulant algorithm for power system harmonic frequency detection is introduced in this paper.In the algorithm,the simultaneous joint diagonalization is carried on to a group of fourth-order cumulant matrix.Then according to the principle of root-music algorithm,the unitary matrix and the diagonal matrix which are obtained can be used to retrieve the harmonic frequencies.The result will provide a reliable basis for the harmonic analysis and refrain.The experiment suggests that this approach has some virtues:with only a series of measurements,several fourth-order cumulant matrix to identify the signals are constructed with one group of sampling data.This can improve the utilization rate of the measurements and the precision of the algorithm;it can effectively and automatically refrain not only the gaussian white noise but also the color noise even when the SNR is low.